What is the main difference between blackout and G-LOC?

The distinction between blackout and G-LOC (G-induced Loss Of Consciousness) is primarily based on the physiological effects experienced by an individual under high G-forces.

When experiencing G-LOC, a person loses consciousness due to a lack of blood flow to the brain, often resulting from excessive G-forces that cause blood to pool in the lower extremities and reduce cerebral perfusion. This is a critical condition, as the individual becomes completely nonresponsive and unaware of their surroundings during the episode.

On the other hand, a blackout typically refers to a temporary loss of vision, rather than a complete loss of consciousness. It can occur at high acceleration but does not result in the individual being unconscious. Vision loss during a blackout can be attributed to insufficient blood flow to the retina or brain regions responsible for processing visual information, but the person remains aware and able to respond once the G-forces are relieved or reduced.

This understanding aligns with the choice that highlights G-LOC as resulting in unconsciousness while a blackout leads to vision loss only, confirming the physiological mechanisms behind these conditions and their significant differences in terms of awareness and response.